Record disk cutting device



Nov. 29, 1949 A. H. SULTAN h RECORD DISK CUTTING DEVI CE 2 Sheets-Sheet2 Filed Aug. 20, 1947 Patented Nov. 29, 1949 UNITED STATES PATENT OFFICEr RECORD DISK CUTTING DEVICE I Arthur H. Sultan, Baltimore, Md.

Application August 20, 1947, Serial No. 769,666

3 Claims.

This invention relates to improvements in record disc cutting devices,particularly of the character for cutting record grooves in phonographrecord blanks.

Y The object of this invention is to improve the construction of devicesfor this purpose, to provide for the cutting of spaced grooves on arecord blank by the action ofa phonograph recorder, using the groove ofone record as a guide for the cutting head that forms a groove inanother record blank. v

This object may be accomplished according to one embodiment of theinvention by an attachment for the standard magnetic or crystalrecording head, which attachment includes a guide that will follow thesound groove of one record disc to cause the recording head to cut acorresponding sound groove in another coacting record disc. Thisattachment has. a trolley member adjustably carried on an arm, towhich'the guide needle may be secured; The attachment is capable ofbeing secured to any standard recording head, having provision foradjustment according to the size thereof, while the trolley isadjustable also to the supporting arm, according to the size of recordused.

This embodiment of the invention is illustrated in the accompanyingdrawings in which:

Fig. 1 is a perspective View of the record disc cutting device appliedto a recording machine;

Fig. 2 is a longitudinal sectional view through the attachment withparts of the recording machine in elevation;

Fig. 3 is a cross section therethrough on the line 33 of Fig. 2 and Fig.4 is a disassembled perspective view of the parts of the attachment.

The invention is shown as applied to a recording machine generallydesignated by the numeral l, which may be of standard construction andis shown as provided with the usual turntable 2, for supporting recorddiscs, two of which are shown at 3 and 4, respectively, held in place onthe turntable 2 by the usual pins 5.

A recording head is shown at 6, having a suitable support I therefor ontop of the machine. The recording head 6 is provided with the usualrecording stylus 8, adjustably secured in place by a screw 9. Theforegoing structure is illustrated and described merely for purpose ofillustration, and any suitable mechanism for the purpose may be used inconnection with this invention, and to which the invention may beapplied.

The attachment which is shown as an embodiment of this invention isadapted to be applied 2 to the recording head 6 to support an auxiliarystylus which is illustrated generally at Ill. The stylus I0 may be inthe form of an ordinary phonograph needle where it is not used for cutting a record groove, but instead follows a groove in the master record3 as a guide for cutting a groove in the record 4. However, these partsmay be reversed when it may be desired to cut a groove in the record 4.The stylus or needle I0 is secured in place by a set screw ll within anopening of a trolley l2.

The trolley I2 preferably is formed as a block of suitable material,such as plastic, which may be fashioned or molded for the purpose. Thetrolley I2 is adapted to fit against the under side of an arm [3, havingan elongated slot 14 extending at an acute angle to the lengthwise axisof the arm as shown in Fig. 4. The upper face of the trolley I2 isundercut at l5, with a rib l6 therebetween that fits into the slot I4,as shown in Fig. 3, where the trolley is secured in place on the arm l3by a bolt II. This bolt is shown of the type having a wing nut 18thereon, to per: mit ready adjustment by hand for sliding the trolleylengthwise of the slot l4 to an adjusted position with respect to thearm l3, after which it may be secured in place by tightening the wingnut 8.

The arm l3 extends laterally from a clamp section l9 that extendspartially around the recording head 6, and coacts with a clamp section20 that extends around the opposite side of the head 6, for supportingthe arm I3 and trolley I! on the head. These clamp sections I9 and 20are adjustably connected together by means of a bolt 2| on the sectionl9, and a slot 22 in the section 20, in the form illustrated, wherebythe sections may be adjusted toward and from each other to fit any sizerecording head as used expressly for recording sound on blank records.

The clamp l9-20 is secured to the recording head 6 by hooks 23 on thelower edges of the sections l9 and 20, as shown in Figs. 2 and 4, whichhooks engage under the edges of the opposite sides of the head 6. Ablock of cushioning material 24, preferably in the form of spongerubber, is shown as fitted within the clamp between the latter and thetop of the recording head as an automatic take-up and for cushioning theconnection of the clamp with the head.

In applying the attachment to the recording head, the clamp Ill-20 islowered over the recording head 6 in the position shown in Fig. 2, andis secured beneath the head 'by the hooks 23. During this securingaction, the sections are dis- 3 connected, but after the hooks areengaged, these sections are drawn together by the bolt 2| and tightenedwith the wing nut thereof. The sponge rubber pad 24 will take up unusedspace in the depth of the arm, according to the size of the latter.

With the nut I8 loosened, the trolley l2 may be moved along the slot I4in the arm 13 until both the guide needle in the trolley and therecording needle on the head 6 rest about one-eighth of an inch from theoutside edge of each of the records 3 and 4. Then the trolley is securedby the tightening of the bolt l1-l 8. Then the guide needle It] may belowered until it rests by its own weight in the groove of the guiderecord, when the set screw H should be tightened to hold the needle inplace.

Then upon operation of the turntable 2, the records 3 and 4 will berotated. A sound groove will be cut in the record 4 identically likethemaster groove previously formed in the record 3, which constitutes themaster record for the pur- DOSE.

While the invention has been illustrated and described in oneembodiment, it is recognized that variations and changes may be madethere- In without departing from the invention, except as'specified inthe claims.

I I- claim:

- 1. In a record disc cutting device adapted for use with a recordinghead operative over a recording turntable, an attachment for saidrecording head comprising an elongated arm, a stylus trolley 'adjustablymounted on the arm for adjustment lengthwise relative thereto, means forsecuring the trolley to the arm in adjusted position, and meansconnected with one end of the armfor clamping connection withthe-recording head, said clamping means comprising a clamp sectionupstanding from the arm with an upper end portion offset therefrom toextend respectively beside the recording head and over the top thereof,an upturned hook at said end of the arm in position to engage the underedge of the recording head in opposed relation to the offset portion andcoacting therewith to hold the clamp section on the recording head, anda second clamp section connected with said offset portion in-position toembrace the opposite side'of the recording head.

z :2. Ina record disc cutting device adapted for use with a recordinghead operative over a recording turntable, an attachment for saidrecording head comprising an elongated arm, a stylus trolley adjustablymounted on the arm for adjustment lengthwise relative thereto, means forsecuring the trolley to the arm in adjusted position, and meansconnected with one end of the arm for clamping connection with therecording head, said clamping means comprising a clamp sectionupstanding from the arm with an upper end portion offset therefrom toextend respectively beside the recording head and over the top thereof,an upturned hook at said end of the arm in position to engage the underedge of the recording head in opposed relation to the offset portion andcoacting therewith to hold the clamp section on the recording head, asecond clamp section having a hook portion in position to engage underthe opposite edge of the recording head with an offset upper end portionin overlapping relation with the ofiset upper end portion of the firstmentioned clamp section, and means for adjustably fastening said offsetend portions together.

3. In a record disc cutting device adapted for use with a recording headoperative over a recording turntable, an attachment for said record inghead comprising an elongated arm, a stylus trolley adjustably mounted onthe arm for adjustment lengthwise relative thereto, means for securingthe trolley to the arm in adjusted position, including an interfittingrib and slot connection between the trolley and the arm for sliding ofthe trolley along the arm, and means connected with one end of the armfor clamping connection with the recording head, said clamping meanscomprising a clamp section upstanding from the arm with an upper endpor-' tion offset therefrom to extend respectively beside therecording'head and over the top thereof, an upturned hook at said end ofthe arm in position to engage the under edge of the recording head inopposed relation to the offset portion and coacting therewith to holdthe clamp section on the recording head, and a second clamp sectionconnected with said ofiset portion in posi-' tion to embrace theopposite side of the recording head.

ARTHUR H. SULTAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

